Which of the following is true regarding ozone depletion in Antarctica?
A) Increasing levels of ultraviolet radiation have not actually been measured at this time.
B) The atmosphere above Antarctica has experienced a complete loss of protective ozone.
C) Maximum ozone depletion occurs during the Antarctic spring, following the development of polar stratospheric clouds in winter.
D) There has actually been a decrease in ultraviolet levels measured at the surfacewhich is contrary to what is predicted by ozone depletion models.
Question 2
Glacial ice is
A) essentially the same as snow.
B) formed from continual accumulation of snow that recrystallizes under its own weight into an ice mass over a period of many years.
C) made of sedimentary rock.
D) generally less dense than snow and firn.
The burning of fossil fuels has greatly increased atmospheric CO2 levels and temperatures.
Killer whales swim by an iceberg with Adelie penguins in the Ross Sea, Antarctica. The Drygal
Biology Is Studied at Many Levels of Organization (Part 2)
In middle childhood, children spend increasing amounts of time with peers and friends.
Variable Gases: Ozone
Proteins can have several levels of structure